4. Biological molecules
A section of Biology, 0610
Listing 10 of 215 questions
For Examiner's Use Enzymes are necessary for many biological processes, such as the digestion of fat. fat + water fatty acids + glycerol lipase Explain why enzymes are necessary for biological processes. Lipase, protease and amylase are enzymes secreted into the alimentary canal. Name one organ that secretes each enzyme. Choose your answers from this list. colon gall bladder liver oesophagus pancreas rectum salivary glands stomach You can use each organ only once. lipase protease amylase For Examiner's Use A group of students investigated the digestion of fat in milk. • They added an alkaline solution to the milk. • They divided the milk into four test-tubes. • They added lipase and bile salts to some of the test-tubes, as shown in Table 5.1. They did this at the same time for each test-tube. • They kept all test-tubes at 40 °C. • After 5 minutes, they added Universal Indicator solution to each test-tube. Table 5.1 test-tube contents colour of pH indicator after 5 minutes at 40 °C A milk, alkaline solution, lipase and bile salts orange B milk, alkaline solution, bile salts and water blue C milk, alkaline solution, lipase and water yellow D milk, alkaline solution and water blue shows the colour of the indicator at different pH values. pH red orange yellow green blue purple Explain why test-tube D was included in the investigation. For Examiner's Use Explain why the colour in test-tube A was orange. Explain the results for test-tubes B and C. test-tube B test-tube C
0610_s13_qp_31
THEORY
2013
Paper 3, Variant 1
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Questions Discovered
215